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  #21  
Old 11-08-2011, 10:16 AM
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Another thing that might be of interest to you . . . back in May, Cummins introduced a 2.8 liter diesel for use by Nissan.

http://news.pickuptrucks.com/2011/05...san-titan.html

As I understand it, it is basically 1/2 of the 5.6 liter V8 diesel block which Cummins developed for Dodge several years ago to use in half-ton pickups. It was "shelved" due to the economy and high fuel prices even though Cummins had already built an entire production line to make the engines.

My old college roommate works as an engineer at Cummins and told me recently (while we were driving around looking at some of Cummins' many test mules) that he was just put on the 5.6 project so it is apparently being revived.
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  #22  
Old 11-08-2011, 10:20 AM
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Originally Posted by PhatFJ View Post
Wow, I did not know that they were that loud. Could he not quiet it down with deferent exhaust configuration or is it the motor noise that is so loud?
As I understand it, it is mechanical noise due to it being a mechanical injection. The ultra-high pressure injectors have played a big part in quieting the new diesels. However, if you want simple and reliable you want mechanical.
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Old 11-08-2011, 10:44 AM
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[quote=74fj40;196148]The only complaint I have about a 4BT is noise... You are going to be wanting to wear earplugs anytime your driving it. not to mention is vibrates everything. Been on the trails with a guy who has one in his buggy and it is loud. he shuts it off as much as he can to avoid noise.

My 55 is lineXed on the inside and the cab noise is not that bad. I can talk on the cell with no problem. I think my 55 has a good vibe. I think the 4BT is to big and heavy for a 40.
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Old 11-08-2011, 11:34 AM
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Quote:
Originally Posted by Woodsman View Post
As I understand it, it is mechanical noise due to it being a mechanical injection. The ultra-high pressure injectors have played a big part in quieting the new diesels. However, if you want simple and reliable you want mechanical.
I have been told that the reason that Toyota's diesels are so quiet and Detroit's are so loud is that Toyota uses indirect injection (precups) and Detroit uses direct injection. I do know that my 1HZ was REALLY nice and quiet, and unlike a powerstroke or cummins, you could actually hold a conversation while standing next to it while the engine was running.
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Old 11-08-2011, 11:36 AM
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You can definitely put a quieter exhaust on there, but it is more the injection pump that makes so much noise. You know the earlier dodge 2500s with the 6bt? sounds similar to that...
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Old 11-08-2011, 11:57 AM
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Quote:
Originally Posted by Rzeppa View Post
I have been told that the reason that Toyota's diesels are so quiet and Detroit's are so loud is that Toyota uses indirect injection (precups) and Detroit uses direct injection. I do know that my 1HZ was REALLY nice and quiet, and unlike a powerstroke or cummins, you could actually hold a conversation while standing next to it while the engine was running.
I thought it was the other way around? I thought IDI was louder and DI was quieter. I believe IDI Toyota engines are the B, 3B, H, 2H, 1HZ, 1PZ, 1KZ - and the DI engines are the 13-14-15B, 12H, 1HD, 1KD, and 1VD series.
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Old 11-08-2011, 12:07 PM
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Matt is right. all the new stuff, tdi's, duramax, new cummins, etc, is all direct injection aka common rail which makes it so quiet.
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  #28  
Old 11-08-2011, 12:14 PM
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You want my opinion? go V10 TDI
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  #29  
Old 11-08-2011, 03:25 PM
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Another vote for Mercedes Benz OEM617 - that is a solid motor. I had an MB 300D for several years and regret selling it (for another Mercedes). Anyway, these engines have cast iron heads, bullet proof IP pumps that will suck glycerine from your tank (i.e. can run on WVO, used hydraulic fluid, used motor oil, biodiesel and other concoctions). I've run BioD in mine and it was super quiet.

The thing to check with this engine, however is the power curve - I believe they produce most of their torque in the upper range of the curve (around 2800-3000 rpms) - good for highway cruising but the low end grunt may suffer as a result. Again, super engines - just not sure about putting it in a crawler.

Good luck -
James
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  #30  
Old 11-08-2011, 04:05 PM
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Quote:
Originally Posted by Overlander View Post
Another vote for Mercedes Benz OEM617 - that is a solid motor. I had an MB 300D for several years and regret selling it (for another Mercedes). Anyway, these engines have cast iron heads, bullet proof IP pumps that will suck glycerine from your tank (i.e. can run on WVO, used hydraulic fluid, used motor oil, biodiesel and other concoctions). I've run BioD in mine and it was super quiet.

The thing to check with this engine, however is the power curve - I believe they produce most of their torque in the upper range of the curve (around 2800-3000 rpms) - good for highway cruising but the low end grunt may suffer as a result. Again, super engines - just not sure about putting it in a crawler.

Good luck -
James
James, thanks for the info!! I was curious about the power curve, I think with the low end gearing I will be ok. How is the idle on the OM617? just thinking if I have to start in gear (low/low) on a hill, my 350 will start just fine but there is a surge as the IAC (idle air control) kicks in for the idle and you need to be ready for it. Thanks again for the response..
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